18706561741 has 4 divisors (see below), whose sum is σ = 21378927712. Its totient is φ = 16034195772.

The previous prime is 18706561691. The next prime is 18706561751. The reversal of 18706561741 is 14716560781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18706561741 - 2³³ = 10116627149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18706561691 and 18706561700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18706561751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1336182975 + ... + 1336182988.

It is an arithmetic number, because the mean of its divisors is an integer number (5344731928).

Almost surely, 2^18706561741 is an apocalyptic number.

It is an amenable number.

18706561741 is a deficient number, since it is larger than the sum of its proper divisors (2672365971).

18706561741 is an equidigital number, since it uses as much as digits as its factorization.

18706561741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2672365970.

The product of its (nonzero) digits is 282240, while the sum is 46.

The spelling of 18706561741 in words is "eighteen billion, seven hundred six million, five hundred sixty-one thousand, seven hundred forty-one".